The Mirror of Lilith or "Lylet" as the Munich Handbook of Necromany states, is meant to be used for divination in particular divination to do with detecting crime, but also with a more general orientation. Here is a translation of the First Mirror of Lilith section from the Munich Handbook of Necromany

First Mirror of Lilith

This is the first mirror of Lilith and of her powers/husbands that are her chief warriors. And the mirror ought to be made specifically for the purpose of their images, and having in mind all the names of their servants, who, as you know, made the things before Cain in the purest place.

Munich Handbook of Necromany fol. 42r

I conjure you, demons, that you will come and swear an oath and answer whatever question I will ask with perfect truth. in the name of the Father and the Son and the Holy Spirit, Amen. Christ + conquered these same + Balbiet + Zelans, Zelles, Dimidero, Cadar, you who each day rise among the stars of heaven where are the three (unknown word: "dogie") of the Cross, and the swift deeds or strokes in the four points of the world, to accomplish all my will in them, through God, where it be acceptable and lawful and speakable, without terror and without any of the unspeakable powers of ever-living Deity, in the true virtue of God, we do call you forth, Lylet, by the office of your father Arieth and by that oath that your mother Nocma spoke to you, that in your own image, and not in the form of a crow, you will converse and be present with us in whatever hour we do summon you into this mirror, that peacefully and humbly and without any deformity you will show yourself to me, and furthermore that two or more of your servants, in any theft or murder or any other doubtful matter, shall give true answers to me, by the power and obedience of God.

Now the mirror ought to be made in the shape of a round shield, or some other way that you may prefer. On the rim thereof, paint the following names: Deus Sanctus, Deus Omnipotens, Deus Fortis, Deus Immortalis, Pater Futuri Saeculi (God the Holy, God the Omnipotent, God the Strong, God the Immortal, Father of the Age to Come). And around the two upper sides the greater seal of Solomon is painted, at the bottom end of the shield the lesser seal of Solomon, and in the middle of the mirror this name Lylet is painted, just as is shown in the figure given below. Thereafter, frame it in the same way as any other glass or mirror. Once this is done, take it silently and secretly to a crossroads or to the sepulcher of some murdered person, in the evening dusk, on a day of Mars or Saturn, and say this conjuration:

I conjure you likewise, Lylet, and your companions, by the annunciation of our Lord Jesus Christ, and by His nativity, and by the coming of the Holy Spirit, the Paraclete, that in whatever hour I call you, you shall appear to me in this mirror with your companions, and show me truly a response or sign of that thing which I shall wish to know'.

This oration being finished, return home by another route. Thereafter, at the same hour and day, go to the crossroad and take the mirror with you, and when you want to know about anything uncertain, you may compell the same spirit to come by reciting the conjuration. Ask what you wish, and they shall tell you. Etc.